Two Decades Later, the Enduring Legacy of 9/11

[Pew Research Center]
"Americans watched in horror as the terrorist attacks of Sept. 11, 2001, left nearly 3,000 people dead in New York City, Washington, D.C., and Shanksville, Pennsylvania. Nearly 20 years later, they watched in sorrow as the nation’s military mission in Afghanistan – which began less than a month after 9/11 – came to a bloody and chaotic conclusion.

Table of contents

A devastating emotional toll, a lasting historical legacy

9/11 transformed U.S. public opinion, but many of its impacts were short-lived

U.S. military response: Afghanistan and Iraq

The ‘new normal’: The threat of terrorism after 9/11

Addressing the threat of terrorism at home and abroad

Views of Muslims, Islam grew more partisan in years after 9/11

The enduring power of the Sept. 11 attacks is clear: An overwhelming share of Americans who are old enough to recall the day remember where they were and what they were doing when they heard the news. Yet an ever-growing number of Americans have no personal memory of that day, either because they were too young or not yet born.

A review of U.S. public opinion in the two decades since 9/11 reveals how a badly shaken nation came together, briefly, in a spirit of sadness and patriotism; how the public initially rallied behind the wars in Afghanistan and Iraq, though support waned over time; and how Americans viewed the threat of terrorism at home and the steps the government took to combat it.

As the country comes to grips with the tumultuous exit of U.S. military forces from Afghanistan, the departure has raised long-term questions about U.S. foreign policy and America’s place in the world. Yet the public’s initial judgments on that mission are clear: A majority endorses the decision to withdraw from Afghanistan, even as it criticizes the Biden administration’s handling of the situation. And after a war that cost thousands of lives – including more than 2,000 American service members – and trillions of dollars in military spending, a new Pew Research Center survey finds that 69% of U.S. adults say the United States has mostly failed to achieve its goals in Afghanistan.
9/11 and first responders